for me, it's like walking with my eyes closed in a room I know perfectly well.
We look at it all day, of all the things we should have perfectly memorized, it should be the keys of the piano!
I also find that when I look at my hands I am less concentrating on how it sounds, and I look forward or close my eyes as often as I can.
This is a very difficult question to answer with any certainty. I do not "actually see" things in my "mind's eye"
Also, I find it very hard to say precisely where I look when I play. I do look vaguely at the keyboard, just habit I suppose, but is the sequence of places I look at the same over the course of the same piece each time ? I don't know but I suspect it varies.